Improvement in scaffolding



PATENT OFFICEo ALFRED BLONDIN, 0F CHICAGO, ILLINOIS.

IMPROVEMENT IN SCAFFOLDING.

Specification forming part of Letters Patent No. 186,45 l, dated January23, 1877; application iiled october 20, 1876.

To all whom it may concern:

Be it known that I, ALFRED BLoNnIN, of Chicago, in the county of Cookand State of Illinois, have invented certain Improvements inWindow-Scaii'olding, of which the following is a specification.:

In the accompanying drawing, which forms a part of this specification,Figure 1 is a top or plan view of my improved scaffolding'. Fig. 2 is avertical sectionof the same on the line m .t of Fig. l.

`Like lettersmof reference made use of in the several figures indicatelike parts wherever used.

In the said drawing, A represents a common window-sill. B B are thesides of the Window-opening or jambs, and C C are the partingfstrips.This much ofa common window-opening has been delineated in the drawing,for the purpose 0f showing how` my i111-, proved scaffolding is appliedto the window.

.-The scaffold proper consists of two brackets, D D, each having lahorizontal beam, d a diagonal strut, 611 and a vertical tie-post, d2.The inner ends of the beams d are formed with hooks e, to hook over theinside of the `window-sill. Blocks F are removably fixed tothe beams cl,near-the inner ends, and, being cut with a notch, f, serve to engage thepartingstrip G C. To each bracket, at or near the block F, is pivoted afolding brace, G These are brought together, as shown in the drawing,and a clamp, H, slipped down over the two, and secured by a set-screw,h. The inner ends of thcbrackets are thus held firmly apart, and forcedagainst the jambs in such a way as to lock them against removal from theWindow.

J is the platform of the scaffold, consisting usually of a single widelight plank of a suitable length.. It is secured to the brakets asfollows: To the outer end ofl each bracket, upon the upper surfacethereof, is secured a Z-shaped metal piece, K, provided with adownwardly-projecting tooth or teeth, k k, below which is a cavity orgain ,77 L, in the surface of the beam d of the bracket, so that theedge ofthe plank, by inclining the whole plank, may be placed under themetal retainer K, and when brought down to a horizontal position thesaid teeth will enter the surface of the plank, and detain it from.slipping out. Upon the brackets, and opposed to the retainers K K, areother Z-formed pieces K' K', not toothed but so attached, by a singlescrew or bolt, that they may be turned like a cupboard-button. Theselatter are turned over the inner edge ofthe plankl When it is in place,as shown in the drawing, locking it securely in place. The scaffoldingthus formed is braced in every direction by the plank J, the braces G G,the hooks e, the notched blocks F, and the struts d1, and yet is soconstructed thatl it may be easily applied and removed, and, when not inuse, may be folded flat, to occupy only a small space.

Having thus fully described the construction and operation of myinvention, that which I claim as new, and desire to secure by LettersPatent, is-

1. VThe combination, in va window-scaffolding, 4of the brackets, hookedat their inner inner ends, the notched blocksF, the folding braces Grand clamp, and the plank J and detents K K', substantially as specified.

2. The scaffold for windows, consisting of a pair of brackets providedwith hooks at their inner ends, and braces Gr, and having the plank Jsecured at theirouter ends, substantially as specified.

3. The brackets provided with the toothed retaining-pieces K and thepivotedV retainingpieces K', and having the inclined gain or cavity L,incombination with the plank J, substantially as specied.

Witnesses: ALFRED BLON DIN LUIs PETERS, FRED. PETERS.

